Kim Si-woo born 28 June 1995 also known as Si Woo Kim, is a South Korean professional golfer who plays on the PGA Tour. He won the 2017 Players Championship to become the youngest ever winner of the event at age 21.
Kim finished tied for 20th at the 2012 PGA Tour Qualifying School. He was only 17 years, 5 months, 6 days old at the time, the youngest player to graduate from the PGA Tour’s qualifying school. Due to PGA Tour rules, he could not become a PGA Tour member until he turned 18, midway through the 2013 season. In eight PGA Tour starts in 2013, Kim missed the cut in seven tournaments and withdrew from the eighth. He also played in seven Web.com Tour events in 2013, making four cuts.
Kim played on the Web.com Tour in 2014, making 15 of 19 cuts including a third-place finish at the Cleveland Open. In 2015, he won his first Web.com Tour event, the Stonebrae Classic, in July. He was the second-youngest winner in Web.com Tour history, after Jason Day. He finished 2015 in tenth place in the Web.com Tour money list, to earn a place on the PGA Tour for 2016.
His first win on the PGA Tour came at the 2016 Wyndham Championship. At 21, he was the season’s youngest winner. His second win on the PGA Tour came at the 2017 Players Championship, beating Ian Poulter and Louis Oosthuizen by three-shots with a bogey-free 69 in his final round, becoming the second Korean to win the title after K. J. Choi in 2011. Ranked 73rd in the world prior to the Players Championship, Kim was the second-lowest ranked player to win the tournament, with 2002 winner Craig Perks ranked outside 200th before his win. Kim moved up to 28th in the world after the win.
Kim lost in a sudden-death playoff at the 2018 RBC Heritage in April. He had held the sole lead for large portions of the final round, but shot three over on the back nine, missing a series of makeable putts, including at the last to win the tournament outright, to fall into a playoff. He lost on the third extra hole of the playoff, when Satoshi Kodaira holed a lengthy birdie putt on the par-3 17th.